China United Network Communications Co Ltd, known as China Unicom, began the commercial rollout of its fourth-generation mobile network on Tuesday, becoming the last of the three Chinese telecom giants to offer such a service, Securities Daily reported.

The report said China Unicom will offer 4G services in 25 cities, including Beijing, Shanghai, Guangzhou and Shenzhen. It plans to expand the service to about 300 cities by the end of 2014.